Date: Tue, 5 Mar 2013 21:47:09 -0800 From: =?ISO-8859-1?Q?Gezeala_M=2E_Bacu=F1o_II?= <gezeala@gmail.com> To: "Reed A. Cartwright" <cartwright@asu.edu> Cc: freebsd-questions@freebsd.org Subject: Re: Tuning ZFS ARC for 512GB Memory Message-ID: <CAJKO3mWP_vjGnaDhCn%2BdobnfYH-dnHE9sbc8OhpF6oLXM5Baxw@mail.gmail.com> In-Reply-To: <CALOkxuwpaWCStTEJPX-bdpCDzXj9OhU-OEMQpfvAuFOgXqfCAg@mail.gmail.com> References: <CALOkxuwpaWCStTEJPX-bdpCDzXj9OhU-OEMQpfvAuFOgXqfCAg@mail.gmail.com>
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Try to read through the email thread I have started and specifically posts (replies) by alc: http://lists.freebsd.org/pipermail/freebsd-performance/2012-August/thread.html#4640 I have followed his suggestions, and with the arc_max setting I used we still have on average free RAM ~137GB. HTH. On Tue, Mar 5, 2013 at 6:36 PM, Reed A. Cartwright <cartwright@asu.edu>wrote: > I have a 512GB memory system that has a 480GB (or so) L2ARC, and a > raidz2 storage pool. No dedup or compression is enabled. Although, I > will enable compression in the future. > > By default vfs.zfs.arc_max is about 300GB and the L2ARC is hardly touched. > > I've seen a couple hints recently on the mailing lists that having too > big of an ARC can be a performance hit because it takes a long time to > inspect it when something needs to integrate over the entries. > > I've also had issues with running 9.1 on this machine due to zfs > deadlocks or stalls and am currently "stuck" using 9.0 with no issue. > > So, I was wondering if shrinking the ARC would potentially help and > what should I shrink it to? > > I am thinking about setting vfs.zfs.arc_max to 64GB. > > Does anyone have an opinion? > > > -- > Reed A. Cartwright, PhD > Assistant Professor of Genomics, Evolution, and Bioinformatics > School of Life Sciences > Center for Evolutionary Medicine and Informatics > The Biodesign Institute > Arizona State University > _______________________________________________ > freebsd-questions@freebsd.org mailing list > http://lists.freebsd.org/mailman/listinfo/freebsd-questions > To unsubscribe, send any mail to " > freebsd-questions-unsubscribe@freebsd.org" >
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